iXBT Labs - Computer Hardware in Detail






Corsair HX620W Power Supply

A good combination of modular design and high efficiency.

September 2, 2008

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Test results

We have checked the PSU against the stated specifications, using the power testbed PSU-test 950W (in Russian) and the digital wattmeter TrueRMS Metrix PX-110 (in Russian).

The primary test is to obtain a cross-load characteristic and draw it on a half-plane limited by the 3.3&5V line power on the Y-axis and the maximum 12V line power on the X-axis. Each point of the graph is colored according to its deviation from the nominal value:

  • Rich green - 1% (excellent);
  • Light green - 2% (very good);
  • Yellow - 3% (good);
  • Orange - 4% (satisfactory);
  • Red - 5% (bad, but inbound);
  • Black - over 5% (poor).

The test results indicate that PSU operation is good. Only heavy load on the 3.3&5V line causes increased deviations on this line. One point on the edge of the half-plane is out of bounds at the maximum asymmetric load on the 3.3&5V line. However, this certain load situation is purely synthetic and can hardly be achieved in a real PC.

The efficiency is the primary characteristic that indicates energy efficiency of a PSU. Its value indicates how many percent of energy consumed from the power supply network will be output by a PSU after conversion. We assume that the efficiency of 85% and higher is excellent, 80-85% is good, 75-80% is satisfactory, below 75% is poor.

The manufacturer stated the efficiency of this PSU as above 80%. We conducted tests for efficiency and power factor in the load range of 50W to 650W.

The test results indicate the efficiency of 79% and higher at 100W to 650W load. The maximum efficiency of 85.5% is achieved at the load of 300W. From 100W to the nominal wattage, the efficiency was at least 79%, power factor being above 94%. We consider these values very good.

To test the performance of the cooling system, we have measured fan rotation speed and PSU exit temperature across the entire load range.

The test results indicate very good performance of the cooling system. Below 200W fan operated at minimum speed and provided its lowest noise. From 200W to 500W rpm and noise grew linearly to the maximum of 1700 rpm. PSU exit temperature varied from 35°C to 37°C.


The reviewed power supply unit performed well in every test and can be recommended for power-consuming computers, including gaming rigs.


  • A lot of detachable connectors
  • High-quality cooling system
  • A complete retail bundle


  • Instability of +5VDC voltage at the maximum load

Corsair HX620 PSU provided by Corsair Russia.

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Page 1: Introduction, design

Page 2: Specifications, interior

Page 3: Test results, conclusions

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